Dự Án Arduino Nâng Cao

/*
  Smart Environmental Monitoring Station
  Complete IoT project với multiple sensors và cloud integration
*/

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include "time.h"

// Configuration
const char* ssid = "YourWiFi";
const char* password = "YourPassword";
const char* serverURL = "http://your-api-endpoint.com/data";

// Sensors
#define DHT_PIN 4
#define LDR_PIN A0
#define SOIL_PIN A1
#define DHT_TYPE DHT22

DHT dht(DHT_PIN, DHT_TYPE);
Adafruit_SSD1306 display(128, 64, &Wire, -1);

// Data structure
struct SensorData {
  float temperature;
  float humidity;
  int lightLevel;
  int soilMoisture;
  String timestamp;
};

// Timing
unsigned long lastReading = 0;
unsigned long lastUpload = 0;
const unsigned long READING_INTERVAL = 5000;   // 5 seconds
const unsigned long UPLOAD_INTERVAL = 300000;  // 5 minutes

void setup() {
  Serial.begin(115200);
  
  // Initialize sensors
  dht.begin();
  
  // Initialize display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 allocation failed");
  }
  
  // Connect WiFi
  connectWiFi();
  
  // Configure time
  configTime(7 * 3600, 0, "pool.ntp.org");
  
  Serial.println("Environmental Monitoring Station Ready");
}

void loop() {
  unsigned long currentTime = millis();
  
  // Read sensors periodically
  if (currentTime - lastReading >= READING_INTERVAL) {
    SensorData data = readSensors();
    displayData(data);
    lastReading = currentTime;
    
    // Upload data periodically
    if (currentTime - lastUpload >= UPLOAD_INTERVAL) {
      uploadData(data);
      lastUpload = currentTime;
    }
  }
  
  delay(100);
}

SensorData readSensors() {
  SensorData data;
  
  data.temperature = dht.readTemperature();
  data.humidity = dht.readHumidity();
  data.lightLevel = map(analogRead(LDR_PIN), 0, 4095, 0, 100);
  data.soilMoisture = map(analogRead(SOIL_PIN), 0, 4095, 100, 0);
  data.timestamp = getTimeString();
  
  // Validate readings
  if (isnan(data.temperature)) data.temperature = -999;
  if (isnan(data.humidity)) data.humidity = -999;
  
  return data;
}

void displayData(SensorData data) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  
  display.setCursor(0, 0);
  display.println("Environmental Monitor");
  display.println();
  
  display.print("Temp: ");
  display.print(data.temperature);
  display.println(" C");
  
  display.print("Humidity: ");
  display.print(data.humidity);
  display.println("%");
  
  display.print("Light: ");
  display.print(data.lightLevel);
  display.println("%");
  
  display.print("Soil: ");
  display.print(data.soilMoisture);
  display.println("%");
  
  display.display();
}

void uploadData(SensorData data) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(serverURL);
    http.addHeader("Content-Type", "application/json");
    
    // Create JSON payload
    StaticJsonDocument<300> doc;
    doc["temperature"] = data.temperature;
    doc["humidity"] = data.humidity;
    doc["light"] = data.lightLevel;
    doc["soil"] = data.soilMoisture;
    doc["timestamp"] = data.timestamp;
    
    String jsonString;
    serializeJson(doc, jsonString);
    
    int httpResponseCode = http.POST(jsonString);
    
    if (httpResponseCode > 0) {
      Serial.print("Data uploaded successfully: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Upload failed: ");
      Serial.println(httpResponseCode);
    }
    
    http.end();
  }
}

void connectWiFi() {
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  Serial.println();
  Serial.print("Connected! IP: ");
  Serial.println(WiFi.localIP());
}

String getTimeString() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    return "N/A";
  }
  
  char timeStr[30];
  strftime(timeStr, sizeof(timeStr), "%Y-%m-%d %H:%M:%S", &timeinfo);
  return String(timeStr);
}